Solenoid driver circuit and method

Details Solenoid driver circuit and method Solenoid driver circuit and method

1996-05-10

1997-12-30

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361154, 361195, H01H 4728

Patent

active

057037485

ABSTRACT:
A solenoid driver circuit is provided that operates a solenoid in a quiet operation by reducing solenoid armature velocity. A pulse signal and a ramp signal are provided by a frequency generator and a ramp generator, respectively. A frequency switching circuit receives the pulse and ramp signals and responsively provides a time varying pulse signal that has a duty cycle that decreases with time. A dwell circuit allows the frequency switching circuit to control the solenoid for a first time period and then provides an on signal to the solenoid, maintaining the solenoid in the on position. The solenoid driver circuit is particularly suitable for use with solenoid controlled valves.

REFERENCES:
patent: 3904938 (1975-09-01), Martin
patent: 4234903 (1980-11-01), Harper
patent: 4266261 (1981-05-01), Streit et al.
patent: 4536818 (1985-08-01), Nielsen
patent: 4729056 (1988-03-01), Edwards et al.
patent: 4812945 (1989-03-01), D'Onofrio
patent: 5381297 (1995-01-01), Weber
patent: 5422780 (1995-06-01), Lignar

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